Remove unneeded default imports in stdlib and tests

libraries/stdlib/coroutines/jvm/src/kotlin/coroutines/SafeContinuationJvm.kt

@@ -5,7 +5,6 @@
 package kotlin.coroutines
 
 import java.util.concurrent.atomic.AtomicReferenceFieldUpdater
-import kotlin.*
 import kotlin.coroutines.intrinsics.CoroutineSingletons.*
 import kotlin.coroutines.intrinsics.COROUTINE_SUSPENDED
 import kotlin.coroutines.jvm.internal.CoroutineStackFrame

libraries/stdlib/coroutines/src/kotlin/sequences/SequenceBuilder.kt

@@ -9,7 +9,6 @@
 
 package kotlin.sequences
 
-import kotlin.*
 import kotlin.coroutines.*
 import kotlin.coroutines.intrinsics.*
 import kotlin.experimental.ExperimentalTypeInference